A 900 mm aggregate plant refers to a facility designed to process and produce aggregates (such as crushed stone, gravel, or sand) with a maximum feed size of 900 mm. These plants are commonly used in construction, road building, and mining industries. The plant typically includes equipment like crushers, screens, conveyors, and storage bins to sort, crush, and classify materials into different sizes. The 900 mm feed size indicates the capability to handle large rocks or raw materials, making it suitable for primary crushing stages.